of the camera, the battery powered light-meter was more shock-resistant, and the "CdS technology" could be used as a selling point in advertising. The housing needed to be changed just slightly, since Waaske unknowingly had adopted the appearance of Rollei's twin-lens reflex cameras, by placing the exposure time and aperture controls to the right and to the left side of the lens. Nevertheless, Rollei's designer Ernst Moeckl revised the housing, and by changing the edge radius made the camera body even smaller. For the mercury battery PX 13 (= PX 625 = MR 9) of the light meter, a place was found inside the camera housing. The film rewind knob of the engineering model was exchanged for a rewind crank, and a hot shoe was added for mounting an electronic flash at the base plate. Placing the hot shoe on top of the camera was not feasible because of the underlying exposure meter and transmission gear. Mounting the hot shoe at the frame cover would likely cause damage when using one of the heavy flash lights of that time. Therefore, for a natural lighting shade, the camera had to be turned upside down, when using a flash, to get the light source above the lens. The projected name for the camera was at first to be the Rollei Privat, which even was the engraving on the final draft in March 1966. But in April 1966, when Peesel decided to designate all Rollei cameras according to the applied film format, the designation became Rollei 35. Mass production started in July 1966. The first ads showed cameras with release bolting devices and battery test keys. The first proved to be redundant, since with the lens inserted the camera could not be released anyway. The latter feature was dropped, for reasons of reliability – electrical contacts could easily fail. The voltage of the mercury battery dropped so rapidly at the end of the battery's life that it would be hard to obtain a wrong exposure. Likewise a switch for the exposure meter was also dropped. The exposure meter was always on, even with the lens inserted. Enclosed in the darkness of the camera bag, practically no current drained from the battery, which therefore remained usable for many years. Focusing Like the majority of 135 cameras in the 1960s, the Rollei 35 is a viewfinder camera - a rangefinder was not included. Around 1970,